Canon PC770 Service Manual - Page 82

®OPERATIONS AND TIMINGIMMIIMIIMMIMIIIMMIEMZEIP C. Controlling the Feeding Mechanism 1. Controlling the Registration Roller The registration roller is controlled by the spring clutch, control ring, registration sensor, and registration solenoid (SL2). When the microprocessor on the DC controller PCB receives the pick-up detection signal from the pre-registration paper sensor (Q751), it turns on the registration solenoid at a specific timing. When the registration solenoid turns on, the pawl moves away from the control ring, allowing the drive of the main motor to be transmitted to the registration roller and moving the copy paper to the photosensitive drum. Spring clutch Control ring Registration roller Paper detecting lever Pawl ---- III SL2 41.1 Co CC Copy paper 0 0 Preregistration roller sensor (Q751) DC controller PCB RPD Figure 3-405 3 - 42 COPYRIGHT OO 1994 CANON INC. CANON PC720170750/770 REVD AUG.1994 PRINTEDIN JAPAN (IMPRIME AU JAPAN)